JP2012000806A - Method for manufacturing of liquid storing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing of a liquid container that suppresses generation of wrinkles or gaps when compressing and inserting the liquid absorbing member, and can cope with individual difference of the liquid absorbing member.SOLUTION: In the method for manufacturing of the liquid container in which a liquid supply part is prepared at a bottom and a liquid absorbing member in which a fiber sheet is laminated is housed, the liquid absorbing member is housed in the liquid container in the direction where a laminated surface of the fiber sheet makes nearly perpendicular to the bottom of the liquid container. The method includes: a step of compressing the liquid absorbing member to a compression size from two facing surfaces nearly parallel and nearly perpendicular to the laminated surface of the fiber sheet by using a first compression member with a guide which can compress a pair of facing surfaces and a second compression member which are a pair of facing surfaces and with a guide which can compress the surfaces perpendicular to a pair of the surfaces; and a step of inserting the liquid absorbing member using the guide. This is the method wherein, the width in the lamination direction of the fiber sheet of the compression surface of the compression member which compresses facing two surfaces perpendicular to the fiber sheet laminated surface is narrower than the compression size in the compression process.

Description

  The present invention relates to a method for manufacturing a liquid storage container for storing a liquid, which is mounted on a liquid discharge apparatus including a liquid discharge head for discharging a liquid.

  The liquid ejection apparatus is provided with a supply system for supplying a liquid such as ink to the liquid ejection head, and a liquid storage container for holding the liquid is detachably connected upstream of the supply system. As a detachable liquid storage container, there is known a container that holds a liquid by providing a liquid absorbing member such as a sponge having a capillary force for holding the liquid therein.

  Conventionally, a method shown in FIGS. 3A to 3G is generally known as a method for inserting the liquid absorbing member into a liquid container (Patent Document 1). 3A is a top view before compression of the liquid absorbing member 21, FIG. 3B is a top view when compressed in one direction, and FIG. 3C is when compressed in a direction substantially perpendicular to the direction. The top view of is shown. 3D is a cross-sectional view in the compression direction in FIG. 3C when inserted into the liquid storage container 11, and FIG. 3E is a cross-sectional view of FIG. 3B when inserted into the liquid storage container 11. ) Is a cross-sectional view in the compression direction, and FIG. 3F is a perspective view at the time of insertion into the liquid storage container 11. FIG. 3G shows a top view of the liquid absorbing member 21 when inserted into the liquid storage container 11. First, as shown in FIGS. 3A to 3C, the liquid absorbing member 21 is sequentially compressed using the compression member 31 to a size smaller than the inner size of the liquid storage container 11. Next, as shown in FIGS. 3D to 3F, a flat guide 32 provided on the compression surface of each compression member 31 is inserted into the liquid storage container 11. Thereafter, the liquid absorbing member 21 is inserted into the liquid storage container 11 using an insertion member (not shown) that is movable in the vertical direction while being compressed. As shown in FIG. 3G, the liquid absorbing member 21 is inserted into the liquid storage container 11 while maintaining the compressed state until just before insertion.

  As another method, the following method is disclosed (Patent Document 2). A predetermined position on the outer peripheral surface of the liquid absorbing member is compressed so as to form a portion having a locally different amount of compression, and the portion having a locally different amount of compression is correspondingly disposed at a predetermined position in the liquid absorbing member. In this way, the compressed liquid absorbing member is inserted into the liquid absorbing member.

JP-A-7-314727 JP 2006-130700 A

  However, when injecting liquid into the liquid storage container, if there are wrinkles on the surface of the liquid absorption member, or if there are gaps between the four corners of the inner wall of the liquid storage container and the four corners of the liquid absorption member, the wrinkles and Liquid may overflow from the gap. As a result, not only does the use efficiency of the liquid decrease, but there is a concern that the overflowing liquid may cause liquid leakage from the atmosphere communication port provided in the lid of the liquid storage container depending on the attitude during distribution and environmental changes. . Therefore, it is desirable that the wrinkles and gaps do not occur when the liquid absorbing member is inserted into the liquid storage container. Further, if wrinkles are generated when the liquid absorbing member is compressed, they remain as wrinkles even after being inserted into the liquid storage container. Therefore, it is desirable not to generate wrinkles even when the liquid absorbing member is compressed.

  Further, for example, when the liquid absorbing member is made of a fiber material having a capillary force to hold the liquid, the individual liquid absorbing member has a density, due to a variation in the fiber diameter, a distribution of welds between fibers, a variation in the amount of fibers, a variation in dimensions, etc. There are individual differences such as mass and dimensions. For this reason, when the liquid absorbing member is compressed by a compression member or the like, the compressive stress is not uniform depending on the individual difference, and local wrinkles may occur in a portion where the stress is concentrated. Furthermore, when the liquid absorbing member is inserted into the liquid storage container, the restoring forces at the four corners of the liquid absorbing member differ depending on the individual difference and the fiber stacking direction, and therefore there is a possibility that gaps will be generated at the four corners of the liquid storage container. is there.

  In the method described in Patent Document 1, the amount of compression of the liquid absorbing member can be adjusted so as not to cause local wrinkles or gaps. However, the generation of wrinkles at the time of compression and insertion cannot be sufficiently prevented, and if there is an individual difference, the amount of compression must be adjusted individually, so further improvement is desired. In the method described in Patent Document 2, wrinkles are not generated when the liquid absorbing member is compressed, but wrinkles are generated at predetermined positions after insertion into the liquid absorbing member. This method is effective as long as two types of liquid absorbing members are inserted and the upper liquid absorbing member has a small amount of compression, that is, no deformation and no wrinkles as described in the embodiment of Patent Document 2. It is. However, when wrinkles occur in the upper liquid absorbing member due to the individual differences, there is a possibility that the outside air and the communication portion may be connected, which may cause ink leakage. It is.

  Therefore, the present invention provides a method for manufacturing a liquid storage container that can suppress generation of wrinkles and gaps when the liquid absorption member is compressed and inserted into the liquid storage container, and can also cope with individual differences in the liquid absorption member. For the purpose.

  In the method for manufacturing a liquid storage container according to the present invention, a supply unit for supplying liquid to the outside is provided on the bottom surface, and a liquid absorbing member for holding the liquid in which a plurality of fiber sheets are stacked is housed inside. The liquid absorbing member is stored in the liquid storage container in a direction in which the laminated surface of the fiber sheet is substantially perpendicular to the bottom surface of the liquid storage container, and faces the liquid storage member. A first compression member having a flat guide on a compression surface capable of compressing a pair of surfaces, and a flat guide on a compression surface capable of compressing a pair of opposed surfaces perpendicular to the pair of surfaces. And compressing the liquid absorbing member from two opposing faces substantially parallel to the laminated surface of the fiber sheet and two opposing faces substantially perpendicular to the laminated surface of the fiber sheet. Compressing to dimensions, and said first and Inserting a guide of a second compression member into the liquid storage container, and inserting the compressed liquid absorption member into the liquid storage container, respectively, in the compression step, A width of the compression surface of the compression member that compresses two opposing surfaces substantially perpendicular to the lamination surface in the lamination direction of the fiber sheet is narrower than the compression dimension.

  According to the present invention, it is possible to suppress the generation of wrinkles and gaps when the liquid absorbing member is compressed and inserted into the liquid storage container, and furthermore, it is possible to cope with individual differences of the liquid absorbing member, and highly reliable liquid storage A container can be provided.

It is a schematic diagram which shows each process of the manufacturing method of the liquid storage container in this embodiment. It is a perspective view of an example of the liquid absorption member in this embodiment. It is a schematic diagram which shows each process of the manufacturing method of the conventional liquid storage container. It is sectional drawing of an example of the liquid storage container in this embodiment. It is the disassembled perspective view which decomposed | disassembled the liquid storage container in this embodiment. It is the schematic of an example of the liquid absorption member insertion apparatus applicable to the method in this embodiment. It is the schematic diagram which observed the liquid absorption member without wrinkle generation | occurrence | production, and the liquid absorption member with wrinkle generation | occurrence | production from the upper surface. It is a graph which shows the relationship between the ratio of the width of the compression surface with respect to the compression dimension in an Example, and wrinkle generation | occurrence | production at the time of compression. It is a graph which shows the relationship between the ratio of the width of the compression surface with respect to the compression dimension in an Example, and product evaluation.

(Configuration of liquid storage container)
FIG. 4 shows a cross-sectional view of an example of the liquid storage container according to the present invention, and FIG. 5 shows an exploded perspective view of the liquid storage container disassembled. 4 and 5 has a liquid absorbing member 21 inserted therein, and a lid 41 is welded (vibrated) on the upper surface. The liquid storage container 11 is detachably mounted on a liquid ejection apparatus such as an ink jet recording apparatus. Although not shown in FIGS. 4 and 5, a supply port and a liquid discharge head are provided on the bottom surface of the liquid storage container 11 as a supply unit for supplying liquid from the liquid storage container 11 to the outside. Yes. In the present invention, the bottom surface and the side surface of the liquid storage container 11 indicate the bottom surface and the side surface of the liquid storage container 11 in use, that is, the state in which the liquid storage container 11 is mounted on the liquid ejection device (when the supply unit is down).

(Liquid absorbing member)
The liquid absorbing member 21 is a member for holding the liquid in the liquid storage container 11, and has a structure in which a plurality of fiber sheets are laminated. FIG. 2 shows a perspective view of an example of the liquid absorbing member 21 according to the present invention. In the liquid absorbing member 21 shown in FIG. 2, fiber sheets are laminated in the fiber sheet lamination direction 24 and have a rectangular parallelepiped shape. As shown in FIG. 5, the liquid absorbing member 21 is accommodated in the liquid storage container 11 in a direction in which the laminated surface of the fiber sheets is substantially perpendicular to the bottom surface of the liquid storage container 11. In the following description, the fiber sheet lamination direction 24 is formally defined as the X direction, the direction indicated by 22 is indicated as the Z direction, and the direction indicated by 23 is indicated as the Y direction.

  As the material of the fiber sheet, a material capable of holding a liquid by capillary force is preferable. The capillary force is defined by the wettability with respect to the liquid, the size of the pores existing inside, and the ratio of the pores. Moreover, when inserting the compressed liquid absorption member 21 in the liquid storage container 11, the material which has compression restoring property is preferable so that a shape may be restored | restored by releasing compression after insertion. Examples of the material that satisfies these conditions include polypropylene (PP) fiber, urethane foam, polyester felt fiber, and the like. These may use only 1 type and may use 2 or more types together. As a manufacturing method of the liquid absorbing member 21, first, after unraveling the cotton-like fiber material, it is made into a sheet shape with a roller (sheet-like fiber material). In this state, the thickness of the sheet is not adjusted. A plurality of the obtained sheet-like fiber materials are laminated to constitute a laminate. Note that the number of sheet-like fiber materials constituting the laminate is adjusted according to the required basis weight of the liquid absorbing member. Subsequently, heating is performed while adjusting the thickness of the laminate, and the fibers are thermally fused to obtain a welded body. The welded body is punched out to a predetermined size to obtain the liquid absorbing member 21.

(Configuration of liquid absorbing member insertion device)
FIG. 6 shows a schematic diagram of an example of a liquid absorbing member insertion device applicable to the method according to the present invention. In this apparatus, as the compression member 31, a first compression member having a flat guide on a compression surface capable of compressing a pair of opposed surfaces, and a pair of opposed surfaces that are perpendicular to the pair of surfaces. And a second compression member having a flat plate-like guide 32 on the compression surface capable of compressing. One of the first compression member and the second compression member is fixed to the jig 61. The other of the first compression member and the second compression member is attached to the tip of the air cylinder 62. By moving the air cylinder 62, the liquid absorbing member 21 is compressed to the compression dimension. In the present invention, the compression dimension indicates the size of the liquid absorbing member 21 compressed by the compression member before being inserted into the liquid storage container 11, and specifically, the distance between the opposing guides 32 after compression. Show. After the compression, the stage 63 on which the liquid storage container 11 is set is raised, the guide 32 is inserted into the liquid storage container 11, and the liquid absorbing member 21 compressed by an insertion member (not shown) movable in the vertical direction. Is inserted into the liquid storage container 11.

  In the compression member 31 used in the present invention, the width in the stacking direction of the fiber sheets of the compression surface of the compression member that compresses two opposing surfaces that are substantially perpendicular to the stacking surface of the fiber sheet of the liquid absorbing member 21 is the compression dimension. It is characterized by being narrower. By making the width of the compression surface narrower than the compression dimension, the liquid absorbing member 21 can sufficiently protrude from both ends of the compression surface of the compression member whose width is reduced during compression, and stress can be released. As a result, wrinkles can be prevented from occurring during compression and insertion.

(Liquid container manufacturing method)
The manufacturing method of the liquid absorption member 21 in this embodiment is demonstrated using Fig.1 (a)-(g). 1A is a top view before compression of the liquid absorbing member 21, FIG. 1B is a top view when compressed in the fiber sheet laminating direction 24, and FIG. 1C is when compressed in the Y direction 23. A top view is shown. 1D is a cross-sectional view in the Y direction 23 when inserted into the liquid storage container 11, and FIG. 1E is a cross-sectional view in the fiber sheet stacking direction 24 when inserted into the liquid storage container 11. FIG. (F) shows the perspective view at the time of insertion in the liquid storage container 11. FIG. FIG. 1G is a top view of the liquid absorbing member 21 when inserted into the liquid storage container 11. First, the liquid absorbing member 21 is set on the compression member A12 to which one of a pair of opposing compression members is connected (FIG. 1 (a)). Next, the movable compression member B13 compresses the liquid absorbing member 21 to two opposing surfaces substantially parallel to the fiber sheet lamination surface, that is, from the fiber sheet lamination direction 24 to the compression dimension (FIG. 1B). . In the compression, the entire surface of the liquid absorbing member 21 to be compressed is compressed by a pair of compression members (one of the compression members A12 and the compression member B13). Next, the movable compression member C14 compresses the liquid absorbing member 21 to two opposing surfaces that are substantially perpendicular to the fiber sheet lamination surface, that is, from the Y direction 23 to the compression dimension (FIG. 1C). In the compression, the width in the fiber sheet lamination direction 24 of the compression surfaces of a pair of opposing compression members (one of the compression members A12 and the compression member C14) used for compression is smaller than the compression dimension. As a result, in the compression, the liquid absorbing member 21 protrudes from both ends of the compression surfaces of the pair of compression members as shown in FIG. 1C, so that the surface of the surface compressed in the step shown in FIG. You can earn length. Therefore, the stress of the liquid absorbing member 21 applied at the time of compression can be dispersed, and the generation of wrinkles generated at the time of compression can be suppressed. Further, even when the material, density, mass, dimensions, and the like of the liquid absorbing member 21 are different, the stress at the time of compression can be dispersed in the same manner to suppress wrinkling.

  A flat guide 32 for inserting the liquid absorbing member 21 into the liquid storage container 11 is provided on the compression surface of each compression member. As shown in FIGS. 1D to 1F, in a state where the guide 32 is inserted into the liquid storage container 11, the liquid absorbing member 21 is liquidized using an insertion member (not shown) that is movable in the vertical direction. Insert into the storage container 11. At this time, as shown in FIG. 1G, the liquid absorbing member 21 is protruded from both ends of the guide 32 provided on the compression surface having a narrow width, and the stress of the liquid absorbing member 21 is dispersed. Then, it is inserted into the liquid storage container 11.

  Hereinafter, a specific configuration of the liquid storage container 11 according to the present invention and a method for manufacturing the liquid storage container 11 will be described in the embodiments. The present invention is not limited to these examples.

[Example 1]
In the present embodiment, the liquid storage container 11 having an internal size of 50 × 25 × 30 mm in height was used. The liquid absorbing member 21 was a laminate of a plurality of fiber sheets made of polypropylene (PP) fibers. The dimension before compression of the liquid absorbing member 21 is 50 × 30 × 30 mm in height, and in relation to the fiber sheet lamination direction 24, the fiber sheet lamination direction 24 is 30 mm (horizontal) in the direction shown in FIG. The Y direction 23 is 50 mm (vertical), and the Z direction 22 is 30 mm (height). The compression size of the liquid absorbing member 21 was 48.5 × 21.5 mm. As the compression member, the compression member A12, the compression member B13, and the compression member C14 shown in FIG. 1 were used.

  First, as shown to Fig.1 (a), the liquid absorption member 21 was arrange | positioned so that two compression surfaces of compression member A12 might be touched. The width of the compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the compression surface of the compression member C14 that faces the compression surface in the fiber sheet lamination direction 24 is 17.0 mm, and the compression dimension The ratio was 79.1% with respect to (21.5 mm). Next, as shown in FIG.1 (b), the fiber sheet lamination direction 24 of the liquid absorption member 21 was compressed from 30 mm to 21.5 mm with compression member A12 and compression member B13. Furthermore, as shown in FIG.1 (c), the Y direction 23 of the liquid absorption member 21 was compressed to 48.5 mm with the compression member A12 and the compression member C14. Thereafter, as shown in FIGS. 1D to 1F, the guides 32 provided on the compression surfaces of the compression member A12, the compression member B13, and the compression member C14 are inserted into the liquid storage container 11 and compressed. The liquid absorbing member 21 was inserted into the liquid storage container 11.

[Example 2]
The compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the width of the compression surface of the compression member C14 that faces the compression surface in the fiber sheet lamination direction 24 are 15.0 mm. The ratio was 69.8% with respect to (21.5 mm). Otherwise, the liquid absorbing member 21 was compressed and inserted into the liquid storage container 11 as in Example 1.

[Example 3]
The compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the width of the compression surface of the compression member C14 that faces the compression surface in the fiber sheet lamination direction 24 are 13.0 mm. The ratio was 60.5% with respect to (21.5 mm). Otherwise, the liquid absorbing member 21 was compressed and inserted into the liquid storage container 11 as in Example 1.

[Example 4]
The compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the width of the compression surface of the compression member C14 that faces the compression surface in the fiber sheet lamination direction 24 are 19.0 mm. The ratio was 88.4% with respect to (21.5 mm). Otherwise, the liquid absorbing member 21 was compressed and inserted into the liquid storage container 11 as in Example 1.

[Comparative Example 1]
The compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the width of the compression surface of the compression member C14 that faces the compression surface in the fiber sheet lamination direction 24 are 21.5 mm. (21.5 mm) and the same (100%). Otherwise, the liquid absorbing member 21 was compressed and inserted into the liquid storage container 11 as in Example 1.

[Reference Example 1]
The width of the compression surface of the compression member A12 that is substantially perpendicular to the fiber sheet lamination surface of the liquid absorbing member 21 and the compression surface of the compression member C14 that faces the compression surface is 11.0 mm, and the compression dimension is 11.0 mm. The ratio was 51.2% with respect to (21.5 mm). Otherwise, the liquid absorbing member 21 was compressed and inserted into the liquid storage container 11 as in Example 1.

(Wrinkle occurrence during compression)
In the said Examples 1-4, the comparative example 1, and the reference example 1, the presence or absence of wrinkle generation | occurrence | production was confirmed in the state which compressed the liquid absorption member 21 by the process of Fig.1 (a)-(c). As a method for confirming the occurrence of wrinkles, after compressing the liquid absorbing member 21 in the order of FIGS. 1A to 1C, the presence or absence of wrinkles during compression was confirmed by observing from the upper surface. FIG. 7A is a schematic view of the liquid absorbing member 21 observed from the top surface in a state where no wrinkle is generated during compression. FIG. 7B is a schematic view of the liquid absorbing member 21 in a state where wrinkles 71 are generated during compression, as observed from the upper surface. The results of confirming the occurrence of wrinkles are shown in Table 1 and FIG. In Table 1 and FIG. 8, the occurrence of wrinkles during compression was evaluated according to the following criteria.
○: Wrinkles are not generated. Δ: Small wrinkles are generated. ×: Wrinkles are generated.

(Check for wrinkles during insertion)
Even when the liquid absorbing member 21 can be compressed without generating wrinkles at the time of compression, if wrinkles are generated when inserted into the liquid storage container 11, it is not preferable for liquid injection or physical distribution. Therefore, in Examples 1 to 4, Comparative Example 1, and Reference Example 1, whether or not wrinkles are generated when the compressed liquid absorbing member 21 is inserted into the liquid storage container 11 is determined whether or not wrinkles are generated during the compression. As well as confirmed. The results are shown in Table 1. In Table 1, the evaluation criteria for the occurrence of wrinkles during insertion are the same as the evaluation criteria for the occurrence of wrinkles during compression.

(Product evaluation)
In Examples 1 to 4, Comparative Example 1, and Reference Example 1, whether or not the liquid storage container 11 can be used as a product depending on the presence or absence of wrinkles during compression or insertion was evaluated according to the following criteria. The results are shown in Table 1 and FIG.
×: Cannot be used as a product ○: Can be used as a product

  About wrinkle generation at the time of compression, from Table 1 and FIG. 8, in Examples 1 to 3 and Reference Example 1 in which the ratio of the width to the compression size of the compression surface is 79.1% or less (width is 17.0 mm or less), No wrinkling was observed during compression. This is because, as shown in FIG. 1 (c), the liquid absorbing member 21 sufficiently protrudes from both ends of the compression member whose width is narrowed by compressing the width of the compression surface to be smaller than the compression dimension, and stress applied during compression is reduced. It is because it can escape. Further, in Example 4 in which the ratio of the width to the compression dimension of the compression surface was 88.4% (width is 19.0 mm), small wrinkles were generated during compression, but this was a level with no problem in product function. On the other hand, in Comparative Example 1 in which the ratio of the width to the compression dimension of the compression surface is 100% (width is 21.5 mm), wrinkles occurred during compression. This is because the compression surface is not narrowed and the stress applied during compression cannot be released. From the above, it has been confirmed that the width of the compression surface is preferably narrower in order to suppress wrinkling when the liquid absorbing member 21 is compressed.

  Moreover, about wrinkle generation | occurrence | production at the time of insertion, the ratio of the width with respect to the compression dimension of a compression surface is 60.5% or more and 79.1% or less (width is 13.0 mm or more, 17.0 mm or less). In No. 3, no wrinkle was generated when inserted into the liquid container 11. On the other hand, in Example 4 where the ratio of the width to the compression dimension of the compression surface is 88.4% (the width is 19.0 mm) as described above, small wrinkles occurred during compression, and thus small wrinkles occurred during insertion. . Further, in Reference Example 1 in which the ratio of the width to the compression dimension of the compression surface is 51.2% (width is 11.0 mm), wrinkles occurred when inserted into the liquid storage container 11. This is because when the liquid absorbing member 21 is compressed, the amount of the liquid absorbing member 21 that protrudes from both ends of the compressing member increases, the amount of contact with the inner wall of the liquid storage container 11 during insertion increases, and stress temporarily concentrates on the protruding portion. Therefore, it is thought that it leads to wrinkle generation.

  From the above, in this embodiment, the ratio of the width to the compression dimension of the compression surface is 60.5% or more and 79.1% or less (the width is 13.0 mm or more and 17.0 mm or less), so that the compression surface is compressed. The generation of wrinkles could be suppressed. Furthermore, the generation of wrinkles during insertion into the liquid storage container 11 can be suppressed, and a highly reliable liquid storage container 11 can be manufactured. In addition, the preferable range of the ratio of the width with respect to the compression dimension of the compression surface effective for preventing the generation of wrinkles varies depending on the material of the fiber sheet constituting the liquid absorbing member 21. Therefore, depending on the material, even when the ratio of the width of the compression surface to the compression dimension is made smaller than that of Reference Example 1, the amount of the liquid absorbing member 21 protruding from both ends of the compression member is small and wrinkles may not occur.

11 Liquid container 12 Compression member A
13 Compression member B
14 Compression member C
21 Liquid absorbing member 22 Z direction 23 Y direction 24 Fiber sheet lamination direction 31 Compression member 32 Guide 41 Lid 61 Jig 62 Air cylinder 63 Stage 71 Wrinkle

Claims (3)

A method for producing a liquid storage container in which a supply unit for supplying liquid to the outside is provided on the bottom surface, and a liquid absorbing member for holding a liquid in which a plurality of fiber sheets are stacked is stored inside,
The liquid absorbing member is accommodated in the liquid storage container in a direction in which the laminated surface of the fiber sheets is substantially perpendicular to the bottom surface of the liquid storage container,
A first compression member having a flat guide on a compression surface capable of compressing a pair of opposed surfaces, and a flat plate on a compression surface capable of compressing a pair of opposed surfaces perpendicular to the pair of surfaces. A second compression member provided with a guide, wherein the liquid absorbing member has two opposing faces that are substantially parallel to the laminated surface of the fiber sheet and two opposite faces that are substantially perpendicular to the laminated surface of the fiber sheet. A process of compressing to a compression dimension;
Inserting the guides of the first and second compression members into the liquid storage container, and inserting the compressed liquid absorbing member into the liquid storage container,
In the compression step, the compression container of the compression member that compresses two opposing surfaces that are substantially perpendicular to the lamination surface of the fiber sheet has a width in the fiber sheet lamination direction that is narrower than the compression dimension. Method.   In the compression step, the liquid absorbing member is compressed from two opposing faces that are substantially parallel to the lamination surface of the fiber sheet, and then compressed from two opposing faces that are substantially perpendicular to the lamination surface of the fiber sheet. 2. A method for producing a liquid container according to 1.   A liquid container manufactured by the method according to claim 1.

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